Electrolyte formulations for lithium ion batteries

Abstract

Electrolyte solutions including combinations of high dielectric and low viscosity solvents. These solvent combinations provide low temperature performance and high temperature stability in lithium ionbattery cells.

Description

Background of the invention [0001] The present invention belongs to the field of battery technology, and more particularly relates to an electrolyte formulation capable of simultaneously achieving low-temperature and high-temperature operation of a lithium-ion battery pack (also known as a lithium-ion battery). [0002] Some applications of Li-ion batteries require a wide operating temperature range. Typically, the power capacity of Li-ion batteries suffers at low temperatures due to one or more of the following factors: 1) the viscosity of the electrolyte increases, resulting in slower Li-ion diffusion; 2) the ionic conductivity of the electrolyte decreases 3) reduced ionic conductivity of the solid electrolyte phase interface (SEI) on the anode (also called anode); and 4) reduced diffusion rate of lithium ions through the electrode material, especially the anode material. [0003] In the past, solutions to the problems associated with operating lithium-ion batteries at low ...

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Problems solved by technology

However, such additional solvents tend to be detrimental to the high temperature performance of Li-ion batteries, and in particular to the high temperature cycle life

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